This handbook constitutes Part Two of a planned series on Military Pyrotechnics and forms part of the Engineering Design handbook Series of the Army Materiel Command. Part Two deals with the problems of safety in the pyrotechnics laboratory and plant, processing procedures and equipment, particle size procedures, and contains a glossary of terms. Part Three, a separate handbook with the same date of publication,data sheets or 128 ingredients used in pyrotechnic compositions.contains Part One, under preparation at the time of publication of Parts Two and Three, will deal with the physical and chemical theoretical aspects of the production of pyrotechnic effects, and the application of the theory to practice. It will also include a history of the pyrotechnic art and an extensive bibliography. A future volume, currently in the planning stage, will be devoted to discussion of methods used in the evaluation of pyrotechnic items, determination of their compliance with the requirements of the using services, special equipment and procedures which are followed in tests and evaluation, and considerations affecting the interpretation of results.